02 Notes - Half Reactions

02 Notes - Half Reactions - 1. Mn 2 (SO 3 ) 3 + Ti Ti 2 (SO...

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Aim: How are redox reactions expressed? QQ: Provide the oxidation state for each element in the compound: 1) K 2 Cr 2 O 7 2) Ca(VO 3 ) 2 3) NaH Do Now: Which element has been oxidized? Reduced? Fe (s) + CuSO 4 (aq) Fe 2 (SO 4 ) 3 (aq) + Cu (s) Redox Reactions 2 Fe (s) + 3 CuSO 4 (aq) Fe 2 (SO 4 ) 3 (aq) + 3 Cu (s) 1. Assign oxidation states to each element in the reaction (reactants and products) 2. Note that the oxidation states of certain elements have changed. 3. If electrons have been lost oxidized 4. If electrons have been gained reduced Practice: Which element has undergone oxidation? Reduction? 1. Mn 2 (SO 3 ) 3 + Ti Ti 2 (SO 3 ) 3 + Mn 2. AgNO 3 + Cu CuNO 3 + Ag 3. 2 Co + 3 Zn(ClO 2 ) 2 2 Co(ClO 2 ) 3 + 3 Zn Half Reactions 2 Fe (s) + 3 CuSO 4 (aq) Fe 2 (SO 4 ) 3 (aq) + 3 Cu (s) Oxidation: Fe 0 Fe 3+ + 3e- Reduction: Cu 2+ + 2e- Cu 0 Electrons will be a product or reactant in half reactions Practice: Write the half reaction for each.
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Unformatted text preview: 1. Mn 2 (SO 3 ) 3 + Ti Ti 2 (SO 3 ) 3 + Mn 2. AgNO 3 + Cu CuNO 3 + Ag 3. 2 Co + 3 Zn(ClO 2 ) 2 2 Co(ClO 2 ) 3 + 3 Zn Oxidizing Agent: the species in a reaction that is reduced Reducing Agent: the species in a reaction that is oxidized Entire species, not just the element! Practice: Indentify the oxidizing and reducing agent. 1. Mn 2 (SO 3 ) 3 + Ti Ti 2 (SO 3 ) 3 + Mn 2. AgNO 3 + Cu CuNO 3 + Ag 3. 2 Co + 3 Zn(ClO 2 ) 2 2 Co(ClO 2 ) 3 + 3 Zn Conclusions • Redox reactions involve the transfer of electrons • Evaluate the oxidation states of each element when it is a reactant and a product ▫ If electrons were lost, oxidation occurred ▫ If electrons were gained, reduction occurred • Oxidizing agent gets reduced • Reducing agent gets oxidized...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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02 Notes - Half Reactions - 1. Mn 2 (SO 3 ) 3 + Ti Ti 2 (SO...

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